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Walter
Walter
Walter is the first cellular board I’ve tested that feels like it was designed by someone who actually deploys IoT in the real world. You get ESP32-S3 compute plus LTE-M/NB-IoT and GPS in a matchbox-sized, certified module with a fully open-source stack. The deep sleep numbers are insane—about 9.5 µA with PSM—and that changes what “field endurance” looks like.
Pros
- +Open-source hardware and software stack (no lock-in)
- +LTE-M + NB-IoT + GPS with WiFi/BLE on ESP32-S3
- +Ultra-low deep sleep power (~9.5 µA with PSM)
- +Certified module (CE/FCC) for faster path to market
- +Good LTE penetration in tough environments
Cons
- -GPS still needs line-of-sight; won’t fix in concrete stairwells
- -Cellular requires towers/SIM, so it’s not truly off-grid
What Data Slayer says
“Because Walter brings GPS and cellular together, I'm turning this board into a real-world tracker and seeing if it could actually be used to lowjack your kids, your pets, maybe even your car”
“Walter is a multi-radio system on a module that pairs the ESP32-S3 with a Sequence Monarch 2 LTE-M NB-IoT modem”
“Walter combines all these radio techniques in a really small module that's also completely certified, CE-FCC, so you can go to market faster”
“Alright, let's break down the different wireless options you'll see in the IoT world, and why Walter's choice of LTE-M and NB-IoT actually matters”
“Which brings us to LTE-M, which is where Walter really shines”
Curated by
Data Slayer